Add insights charts to storybook

What does this MR do and why?

Adds additional stories for insights:

• Adds stories for the insights_page.vue component
• Adds stories for the insights_chart_error.vue component

References

Please include cross links to any resources that are relevant to this MR This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

• Insights - Add insights charts to storybook (#469447)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

How to set up and validate locally

$ yarn storybook:start

Related to #469447